1 definition found magalia - U.S. Gazetteer (1990) : Magalia, CA (CDP, FIPS 45120) Location: 39.82752 N, 121.61080 W Population (1990): 8987 (4191 housing units) Area: 41.6 sq km (land), 0.0 sq km (water) Zip code(s): 95954